preventing crash if there's no error to display.

sqlsrv.php

@@ -3,7 +3,7 @@
 /**
  * @desc   A simple and convenient php sqlsrv class
  * @author Originaly made by Yaseng WwW.Yaseng.Me, now maintained and update by Sebastien Plante
- * @version v1.4
+ * @version v1.5
  * @link https://gitea.urbanghetto.net/nka/php_sqlsrv_class
  */
 
@@ -22,7 +22,7 @@ class sqlsrv
         $this->conn = @sqlsrv_connect($server, array('UID' => $user, 'PWD' => $pass, 'Database' => $dbname, 'LoginTimeout' => 10));
         if ($this->conn === false) {
             $this->error_log[] = sqlsrv_errors();
-			throw new Exception($this->error_log[0][0]["message"]);
+            throw new Exception(($this->error_log[0][0]["message"] ?? ''));
         }
     }
 
@@ -33,7 +33,7 @@ class sqlsrv
         $this->sql_log[] = $sql;
         if ($stmt === false) {
             $this->error_log[] = sqlsrv_errors();
-			throw new Exception($this->error_log[0][0]["message"]);
+            throw new Exception(($this->error_log[0][0]["message"] ?? ''));
         } else {
             $this->query_id = $stmt;
             $this->num_rows = $this->affectedRows();
@@ -67,7 +67,7 @@ class sqlsrv
 
         $stmt = sqlsrv_query($this->conn, $sql, $params);
         if ($stmt === false) {
-			throw new Exception($this->error_log[0][0]["message"]);
+            throw new Exception(($this->error_log[0][0]["message"] ?? ''));
         } else {
             $data = array();
             while ($row = @sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
@@ -84,7 +84,7 @@ class sqlsrv
 
         $stmt = sqlsrv_query($this->conn, $sql, $params);
         if ($stmt === false) {
-			throw new Exception($this->error_log[0][0]["message"]);
+            throw new Exception(($this->error_log[0][0]["message"] ?? ''));
         } else {
             return  sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC);
         }